Picking the wrong size chew is one of the most common parasite-protection mistakes — and one of the easiest to fix. Five weight bands cover every dog from a 2-kg toy puppy to a 45-kg lab, and there's exactly one right answer for your dog.
In Short:
Advocate Ultra Chew comes in five weight bands: Extra Small (2–2.8 kg), Small (2.8–5.5 kg), Medium (5.5–11 kg), Large (11–22 kg) and Extra Large (22–45 kg).
Pick the band your dog's current weight sits inside — never round up or split a chew. The chew is approved from 8 weeks of age and 2 kg, given once a month with food, with single-pack, 3-pack and 6-pack options available across the Small through Extra Large variants.
How to Pick the Right Advocate Ultra Chew Weight Band
Sizing comes down to your dog's current weight, not their breed or what the box looked like last year. Australian dogs change weight constantly — a kelpie at peak fitness sits at the bottom of a band, the same dog after a quiet winter sits at the top. Weigh your dog within a fortnight of buying a new pack and pick the band their actual weight sits inside. If they're at the upper edge of one band, go with that band — never round up to the next size, because higher doses are calibrated for heavier dogs and don't add coverage for lighter ones.
If your household has dogs in different weight bands, buy a pack for each dog rather than splitting larger chews. Active ingredients aren't evenly distributed inside a chew, so a half-chew doesn't deliver half a dose — it delivers an unpredictable one. The 3-pack and 6-pack options are usually cheaper per dose than singles, so even multi-dog households almost always come out ahead with a 6-pack per dog rather than juggling singles.
Advocate Ultra Chew vs the Old Spot-On Weight Bands
Owners switching across from the original Advocate spot-on will notice the chew uses different bands. The spot-on ran on 4–10 kg, 10–25 kg and over-25-kg sizes; the chew runs on five bands from 2 kg to 45 kg, including a true puppy-and-toy-breed Extra Small at the bottom and a separate Extra Large for dogs over 22 kg. Most spot-on Medium (4–10 kg) dogs map to the chew's Small or Medium, and most spot-on Large (10–25 kg) dogs map to the chew's Large — but check your dog's current weight rather than assuming.
Pack Sizes and Cost-Per-Dose
Most variants are sold in three pack sizes: a Single (one month's protection), a 3-pack (one quarter), and a 6-pack (six months). The Extra Small variant is currently sold only as a Single. Per-dose pricing falls as you go up — a 6-pack per dose is almost always cheaper than buying six singles — so unless you're switching brands and want to test palatability first, a 6-pack is the default to buy.
Switching Sizes as a Puppy Grows
Puppies move through weight bands quickly. A 3-kg puppy starting on the Extra Small (2–2.8 kg) will likely outgrow that band within weeks — most owners buy a Single Extra Small to bridge until the puppy hits 2.8 kg, then switch to a 3-pack of the next band up. Reweigh every dose-cycle until growth slows around 8–12 months, then settle on the adult band.
Frequently Asked Questions
How do I know what size Advocate Ultra Chew to buy?
Weigh your dog within the last two weeks and pick the band that contains that weight. Extra Small is 2–2.8 kg, Small is 2.8–5.5 kg, Medium is 5.5–11 kg, Large is 11–22 kg and Extra Large is 22–45 kg. If your dog is exactly on a boundary (say, 11 kg), pick the smaller band — that's the dose calibrated for their weight.
Can I split a chew or give two smaller chews instead of one big one?
No. Active ingredients aren't evenly distributed inside the chew, so a half-chew delivers an unpredictable dose. Combining two smaller chews can also overdose on one ingredient while underdosing another. Always give the single chew sized for your dog's weight.
My dog is between sizes — which one should I pick?
Pick the smaller band. The dose inside each chew is calibrated to the band's weight range, and going up to the larger band gives a higher dose than your dog actually needs. The only exception is when your dog is actively growing through a boundary — start with the band their current weight is in, and reweigh next month.
What's the difference between the 3-pack and the 6-pack?
Three months of protection versus six months. Per-dose pricing is almost always lower in the 6-pack, so it's the default best-value option for any dog that's settled into an adult weight band. The 3-pack suits puppies still growing through bands, dogs with weight changes flagged by your vet, or owners trialling the chew for the first time.
Do all five sizes come in 3-pack and 6-pack?
Currently no. Small, Medium, Large and Extra Large are sold as Single, 3-pack and 6-pack at most retailers. Extra Small is sold as a Single only — a deliberate choice given puppies that start on Extra Small typically outgrow it before a 3-pack would be used up.
Does Advocate Ultra Chew work the same way at every size?
Yes. The active-ingredient ratio is the same across the range — only the total dose changes to match the dog's body weight. A correctly-sized Extra Small chew gives a 2.5-kg toy breed the same proportional protection that a correctly-sized Extra Large gives a 35-kg lab.
Speed of action (fleas within 2 hours, ticks within 4) and duration (one month) are identical across all five sizes.
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